Manufacture of incandescent electric lamps



(No Model.)

A. BORNHOLDT. v MANUFACTURE OF INGANDESGENT- ELBGTRIG LAMPS.

No. 441,127. Patented Nov. 25, 1890.

ER K

WITNESSES:

By/j '4 M nrromvsys.

UNITE STATES ATENT. FFICE.

ADOLPH BORNHOLDT, OFBROOKLYN, NEW YORK.

MANUFACTURE OF INCANDESCENT ELECTRIC LAMPS.

SPECIFICATION forming part of Letters Patent No. 441,127, dated November25, 1890.

Application filed March 19, 1890- Serial No. 344,499. (No model.)

To aZZ whom it may concern:

Be it known that I, ADOLPH BQRNI-IOLDT, a resident of the city ofBrooklyn, Kings county, State of New York, have invented an ImprovedProcess of Exhausting Air from Electric-Light Bulbs and other Vessels,of which the following is a specification, reference being had to theaccompanying drawings, forming part of same, wherein- Figure 1represents a side view, partly in section, of a vacuum-cylindercontaining series of electric-light bulbs, showing the position forreceiving the vacuum. Fig. 2 represents a similar view of saidvacuum-cylinder, showing it opened after the vacuum has been created.Fig. 3 is a sectional view, on a larger scale, of the stopper used bypreference in the vessels to be operated upon.

The object of this invention is to facilitate or improve the manner ofconstructing a vacuum in electric-light bulbs and other vessels.Heretofore in creating a vacuum in an electric-light bulb the mouth ofsaid bulb had to be closed by a stopper carrying the electricconductors, and opposite the month there was an opening left in the bulbthrough which the appliances for creating the vacuum were applied, whichopening afterward had to be closed by sealing the glass, an operationexpensive, tedious, and resulting in innumerable breakages.

My invention consists in the process of creating a vacuum with the aidof a multiple stopper-that is, one stopper within the other-the processconsisting in first holding the vessel in inverted position, thusallowing the auxiliary stopper to drop open, in then applying the vacuumprocess, withdrawing the air from the vessel, and in then reversing thevessel, so as to cause the auxiliary stopper to close the passagethrough which the air was exhausted, thereby sealing the vessel againstthe introduction of atmospheric air, all as hereinafter more fullydescribed.

In the drawings, the letters A A represent electric-light bulbs to besubjected to my process. Each bulb or vessel A is supplied with astopper I, (see Fig. 3), which has a tubular passage a, into which fitsan auxiliary or gravity stopper J. This gravitystopper is of taperingform to fit a corresponding tapering portion of the passage a, andrests, when on its seat, as in Fig. 3, on a support I), that trav ersesthe passage a. The upper part of the stopper proper I has lugs e orother obstructions placed in the way of the auxiliary or gravity stopperJ in such manner that when the stopper I is inverted the stopper J candrop as far as the obstruction 6 will allow away from its inner support1), thereby producing communication of the external atmosphere with thepassage a.

I do not here claim anything relating to this 7 stopper 1, because thatpart of my invention which relates to the construction thereof is madethe subject of another independent application for patent, Serial No.344,500, filed by me March 19, 1890.

The vessels A A, each containing astopper I I, such as has hereinabovebeen described, are placed into a vacuum-cylinder B, which containssuitable racks H for holding these vessels A A in inverted position.While in this position the gravity-stopper .T of each vessel A dropsopen. The cylinder 0, being tightly closed, is now connected by a pipe Fwith an air-pump and air withdrawn from the cylinder and from each ofthe vessels A A to the desired extent. Thereupon the aperture at f ofthe vacuum-cylinder must be closed, and the cylinder with its contentsis then turned half around on its trunnions G G, so as to bring thestoppers to the tops of the vessels A A, thus causing thegravity-stoppers J to drop to their seats, as in Fig. 3, and to thusseal each vessel A. Air is now by suitable means admitted to thevacuum-cylinder, so that atmospheric pressure will bear upon eachgravity=stopper J holding it in place, even if thereafter the cylinder13 should again be turned into the position shown in Fig. 1 to allow theconvenient removal of the bulbs from the racks, as in Fig. 2. ThusWithout inconvenience I am enabled to create a vacuum to the desiredextent within each vessel A and treat a great many vessels of the samekind at the same time and to insurethe proper sealing of eachautomatically and without risk of breakage or the necessity of extralabor.

IOU

Having now described my invention, what I vessel A, having agravity-stopper J, which and in thereupon admitting atmospheric airprocess consists in first placing each vessel to the outside of eachvessel A, substantially A in inverted position into a vacnum-cy1inasherein shown and described.

der, and then While the gravity-stopper is open ADOLPI-I BORNHOLDT. 5withdrawing the air from each vessel A, and Vitnesses:

in then inverting each vessel A, thereby caus- HENRY E. EVERDING,

ing the gravity-stopper to drop to its seat, LIVINGSTON EMERY.

